Electrical translating apparatus



Jan. 26, 1932. p. BOWLING 1,842,392 ELECTRICAL TRANSLATING APPARATUS Filed Dec. 12, 1950 INVENTOR: Do TI/ na BY @R'F/fl ATTORNEY.

"UNITED srATss Patented Jan. 26, 193 2 PATENT orricn PHILIP E. 'DOWLING, 0F SWSSVAELE, PENNSYLVANM, ASSIGNDR TO THE UNIQN SWITCH do SIGNAL COMPANY, OF SWISSVALE, PENNSYLVANIA, A CORPORATION PENNSYLVANIA 'nnnormcnn rnsnsmrnie nrnenerns Application filed Biecernher 12,, 19%.. Serial No. 501,799.

My invention relates to electrical translating apparatus, and particularly to apparatus involving relays oi the amplifying transformer type.

The output winding of a relay of this type ordinarily has comparatively low impedance, so that when two or more such relays are connected in multiple across a load, the on put winding of a relay which is deenergized may form a path oi comparatively low im pedance for the output winding of an energized relay, thereby diverting from the load a considerable proportion of the output of the energized relay.

One feature of my invention is the prot i sion, in relays of this character, of

for causing the output winding to have a relatively high impedance when the relay is deenergized, and a relativelylow impedance when the relay is energized, thereby preventing a deenergized relay from shunting any considerable part of the output of an'energized relay from the load.

I will describe one form of apparatus embodying my invention, and will then point out the novel features thereoi in claims.

In the accompanying drawings, Fig. l is a diagrammatic View showing one "form apparatus embodying my invention. Fig. 2 is a view showing the structure ofeach of. the

relays D of Fig. l.

Similar reference characters refer to similar parts in each of the views.

Referring first to Fig. 1, the reference characters D and D designate relays of the amplifying transformer type, each of which comprises an output wlnding 9 and a control winding 8. The two output windings 9 are connected in multiple across a load 11 which, as here shown, is a railway track circuit.- Relay D comprises a primary winding 4 connected with a source of alternating current G the frequency ofwhich may, for ex ample, be 100 cycles per second. The .control winding 8 is at tlmes connected with a source of direct current F through a front contact 10 of a relay E and the parts are so arranged that when contact lG'is open, relay D delivers no current to the load, whereas, when contact 10 is closed, relay D delivers second. It follows that when contact of:-

relay E is open, relay D will deliver no cur rent to the load, but that when relay E is energized, relay D will deliver 150 cycle current to the load.

Assuming now that relay D is energized and relay D is deenergized, it will apparent that unless the impedance of winding 9 of relay D is high, this winding will shunt from the load aconsiderahle part of the current delivered by relay D. A similar condition would exist when relay D is e: ergized and relay D deenergized. In ace d ance with present invention, lprovide means "for increasing the impedance oi. each output winding 9 times except when the associated control winding 8 is'energized.

Referring now to Fig. 2, each relay D cone prises three magnetizahle cores Cores A. and C each. have three legs 1, 2 and 3, whereas, core B has only two legs 12 and 13. The primary winding l encloses leg 3 core A and leg 13 of core 18, whereas, the output winding 9 encloses leg 12 of core B and leg 3 of core (3.. The control winding 8 is placed on the middle leg 2 of core A. An auxiliary winding 5 is placed on the middle leg 2 or around leg 13 of core B. The result is that practically all of the flux due to the current inprimary winding 4.will flow through coreA' instead ofthrough coreB because of the relatively much higher reluctance of core B due to the windings. thereon. In other words,

substantially none of the flux from winding 4 will flow through windings 6 and 9. It follows that the output winding 9 is deenergized, and that the same thing is true of the auxiliary winding 5. The permeability of core C is then high, with the result that the impedance of the output winding 9 is high. When contact 10 is closed, however, so that winding 8 is energized, the permeability of core A is decreased, with the result that the flux due to current in winding 4 is forced to flow through core B. This flux creates alternating current in the winding 9, and also in the winding 6 with the result that direct current is supplied to the auxiliary winding 5. This current in Winding 5 decreases the permeability of core C thereby decreasing the impedance of the output winding 9.

The middle leg of each core A and C is provided with a copper sleeve 7 to prevent the flow of alternating current through these legs.

When an auxiliary load, such as a lamp, is to be supplied with current from each relay when and only when the relay is energized,

. it is obvious that this load fnay be connected with winding 6. It is also obvious that winding 5 may be energized by means other than winding 6 such, for example, as by part of the current supplied to the control winding 8 or by part oft-he current furnished by the output winding 9.

Although I have herein shown and described only one form of apparatus embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is: t

1. In combination, a transformer having a primary winding connected with a source of alternating current, an output winding inductively coupled with said primary winding and normally having high impedance, means for normally shunting flux due to cur rent in said primary winding away from said output winding, a control winding effective when energized to force flux due to current in said primary winding through said output winding, and means for reducing the impedance of said output winding when said control winding is energized.

2. In combination, a transformer having a primary winding connected with a source of alternating current, an output winding inductivelv coupled with said primary Winding and normally having high impedance, means for normally shunting flux due to current in said primary winding away from said output winding, a control winding effective when energized to force flux due to current in said primary winding through saidoutput winding, and means responsive to flux linking said primary and output windings for reducing the impedance of said output winding.

3. In combination, a transformer having a primary winding connected with a source of alternating current, an output winding inductively coupled with said primary winding, means for normally causing said output winding to have high impedance, means for normally shunting the greater part of the flux due to current in said primary winding away from said output winding, and means including a control winding for forcing flux due to current in said primary winding through said output winding and reducing the impedance of said output winding when the control winding is energized.

4. In combination, three magnetizable cores A, B and C, a primary winding enclosing portions of cores A and B and connected with a source of alternating current, an output winding enclosing portions of cores B and C, a control winding on core A, a fourth winding on core C, and a fifth winding on core B connected with said fourth winding through a rectifier.

5. In combination, three magnetizable cores A, B and C, a primary winding enclosing portions of cores A and B and connected with a source of alternating current, an output winding enclosing portions of cores B and C, a control winding on core A, a fourth winding on core 0', and means for. supplying said fourth winding with current due to the flux flowing in core B.

6. In combination, three magnetizable cores A, B and C, a primary winding enclosing portions of cores A and B and connected with a source of alternating current, an output winding enclosing portions of cores B and C, a control windlng on core A, a fourth winding on core C, and means for energizing said fourth winding when and only when said control winding is energized.

7. In combination, two transformers each having a primary winding connected with a source of alternating current, an output winding on each transformer inductively cou-' pled with'the primary winding on the same transformer and normally having high impedance, said output windings being connected in parallel, a control winding on each transformer arranged to be supplied at times with direct current, means for shunting flux Y due to current in each primary winding away from the associated output winding except when the associated control winding is energized, and means for reducing the impedance of each output winding when and only when the associated control winding is energized.

8. In combination, a primary winding connected with a source of alternating current, an output winding, a magnetizable core passing through said two windings, a second core passing through said primary windin and normally. shunting most of the flux ue to current in the primary winding away from said output windin a control windin on said second core w ich when energize reduces the permeability of such core and so forces most of theflux due to current in said primary winding through said output winding, athird core passing through said output winding to normally increase the impedance thereof, an auxiliary winding on said third core arranged when energized to reduce the permeability of the third core and so reduce the impedance of said output winding, and means for energizing said auxiliary winding when said control winding is energized.

' In testimony whereof I afiix my signature.

PHILIP H. DOWLING. 

